Keeper of the Superfluous Es!

I was talking about the very first batch, though. He had to have been brewing it constantly throughout the school year, but he and Wormtail had some ready before they even went to kidnap Moody. That's the batch I was referring to. And the book specifically says, "Wormtail and I did it. We had prepared the Polyjuice Potion beforehand," (that's Crouch Jr. speaking) which means they made it themselves rather than purchasing it from someone else.